Pinking machine



M. GLAssBr-:RG E-rAL 2,281,575

PINKING'MACHINE Filed Sept. 26, 1939 2 Sheets-Sheet l beg? Morris Glez lI I! Ilz! May 5, 1942.

m NN N Z May 5 1942- M. GLAssBERG ET Al. 2,281,575

` PINKING MACHINE Filed Sept. 26, 1939 2 Sheets-Sheet 2 Patented May 5,1942 PINKING MACHENE Morris Glassberg and Bernard Chester, Kingston,

N. Y., assignors to Clear Bed Super-Finkel Corporation, Kingston, N. Y.,a corporation of New York Application September 26, 1939, Serial N o.296,563

(,Cl. 11B- 122) 16 Claims.

This invention relates to sewing machine attachments and moreparticularly to an improved attachment for pinking. This attachment isdesigned for use on sewing machines of the type of the 95 Class Singermachines and those of similar construction.

The purpose of the invention is to provide a pinker, simple in operationwith a minimum number of parts which, with the exception of the cutteror knife, will be wholly beneath the bed of the sewing machine.

A further object of our invention is to provide a pinking mechanism thatcan be thrown in and out of operation instantaneously and which whenthrown out of operation leaves the sewing bed of the machine free andunencumbered for plain sewing.

A further object is to provide a simple positive acting pinker in whichthe actuating arm, the only reciprocating member, is of a floatingnature with weight and frictional points reduced to a minimum, thusproviding greater wearing qualities with less vibration.

Another object is to provide an attachment of the type described thatmay be easily installed on existing machines without removing themachine from the owners premises and without milling or otherwisemutilating the machine or ailecting its normal eciency.

In the accompanying drawings- Fig. 1 is a side view partly in crosssection showing one form of our improved pinker;

Fig. 2 is an end view thereof taken on the line 2-2 of Fig. 1;

Fig. 3 is a sectional View showing the means for throwing the pinker outof operation;

Fig. 4 is a plan view of the knife section of the` pinker showing thethroat plate;

Fig. 4a is a perspective view partly in section of two pieces of clothwhich have been top stitched together with the pinker in operation;

Fig. 5 is a sectional view of a piece of cloth which has been runthrough the machine with the pinker in operation;

Fig. 6 is a side view similar to Fig. 1, of a modied form of ourinvention;

Fig. 7 is an end View taken on the line 1 1 of Fig. 6.

Referring more particularly to the drawings, our device is adaptable tobe attached to the bed I0 of the conventional machine of the type of 95Class Singer sewing machines having the usual hook shaft II, shuttle I2and throat plate I3. The device is supported by a substantially U-shapedmember I4 which is fastened to the bed I0 by means of bolts I5 passingthrough the L-shaped ends I6 of the member I4. A set screw I'l is alsoprovided to adjust the position of the member I i with relation to thebed IU. Due to the nature of the bolts I5 and the use of the set screwI'I it is possible to attach our device to the bed of the sewing machinewithout milling the bottom thereof and by merely drilling andtap-- pingtwo holes in the bed of the machine. p

Mounted on the member I Il in the bushing 20 is a shaft 2E. On the outerend of the shaft 2I is a reduction gear 22 fastened thereto by a gearhub 23 and a set screw 24. The gear 22 engages a smaller gear 25fastened on the hook shaft II by means of a gear hub 26 and a set screw2l.V

. edges 6I which are adapted to engage cutting edges 62 of the throatplate I3.

The upper end of the arm 4l) is curved at 4I to allow its passage aroundthe hook shaft Il and the lower end 42 is cut away to form a fork aroundthe bearing extension 28. The lower ends of the fork are joined by thebolt 43. Mounted on the arm 4E] is a fixed roller 45 which engages theinner face 46 of the camS. Pivotally mounted on the arm 4i) is a secondroller 41 which engages the outer face 48 of the cam 30. The roller 41is mounted on the pivotal member 50 which pivots on the eccentric bolt5I. It will be seen that by loosening the lock nuts 52 and rotating thebolt 5I the pressure of the roller 47 against the outer face of the cam48 may be adjusted.

Pivoted on the arm 49 at 55 is an elbow leverI 56. Running from one end51 of the elbow lever 55 to the member 5i) at 58 is a leaf spring 59.When the elbow lever 56 is drawn backwardly and downwardly as shown inFig. 1 the leaf spring 59 is drawn directly across a pivotal point 55 oftheelbow lever 5S in a locked position bringing the end 51 of the lever5B and the connecting point 58 of the member 50 in a direct line withthe pivotal point 55. Thus the member 50 is held backwardly against thearm 4I) by the leaf spring 59 maintaining the roller 4'! in contact withthe outer face i8 of the cam 3i). In this position with the rollercontacting the inner face 46A of the cam Sil and the roller ilcontacting the outer face 48 of the cam 3l] the arm 40 will moveupwardly and downwardly as the cam 33 rotates, thus actuating thepinking knife Eil.

Mounted on the center 1Q of the U-shaped frame I4 and pivoted at 1ithereto is an elbow member 12. Roller bearing 13 is mounted on the uppersection 14 of said elbow 'I2 and a bolt or screw 15 passes through thelower end IS of said elbow and contacts the bed or center 'Il of theframe I4. It will be seen that by turning the bolt 15 the position ofthe elbow member 12 and roller bearing 13 will be changed and thepressure of the roller 13 against the floating arm 4Q may be varied.

On the bolt 43 at the bottom of the fork 42 is a spring 65 which engagesa hook 66 at the end of the bracket 61 mounted on the bottom orsupporting frame I4. The bracket 61 is secured by the screws or bolts 63which engage a slot in the bracket 61 so that the pressure on the spring65 may be varied. The action of the spring 65 is to maintain pressure onthe lower end of the floating arm 4l) which pivots on the roller bearing13 so as to force the cutting edges 6I of the knife 60 against the edges62 of the throat plate I3 in order to insure cutting action as the knifemoves downwardly against the throat plate.

When the pinker is to be thrown out of operation the movement of thelever 5'6 forwardly and upwardly as shown in Fig. 3 will carry leafspring 59 forwardly thus releasing the member 50 and moving the roller41 upwardly and out of contact with the face 48 of the cam 3U. The

arm will then be brought downwardly by the action of the inner face 46of the cam 3l] upon the roller 45 and will maintain this position byvirtue of its own weight together with pressure of the knife 3B onthroat plate I3 and the tendency of the spring to draw the arm 40 to itslowest position. In this position the roller 45 is out of contact withthe inner face 46 of the cam 3i) and the pinker is entirely out ofoperation. When the pinker is to be operated lever 5S is pulleddownwardly thus bringing the roller 41 into engagement with the outerface 48 of the cam 30. This will cause the pinking knife to moveupwardly and downwardly in the throat plate I3 with the edges 6l of thepinking knife engaging edges 62' of the throat plate I3 and to pink thecloth A (as shown in Fig. 5) as the sewing machine sews. With ourmachine it is not only possible to do straight stitchingas indicated inFig. 5 but it is also possible to do top stitching as indicated in Fig.

4a, a conventional part of the machine turning the cloth before it isstitched. It will be seen that the operation of the pinker in no wayaffects or limits the use of the sewing machine.

In the modified form of the invention shown in Figs. 6 and 7, thetwo-faced cam is not necessary, and a single faced elliptical cam 363engages a roller 8| mounted on the lower portion 82 of the arm 43. Itwill be noted in Fig. 7 that the fork 42 is closed to form the singlearm 82. In the mcdied form a spring 83 is connected at 84 to the bottomof the U-shaped member I4 and runs at an angle to a hook 85 on the lowerend 82 of the arm 4B. The action of the cam upon the roller 8| forcesthe arm 4i) downwardly against the spring B3 with the edges 6I of theknife 60 against the edges 62 of the throat plate I3. The spring 83 actsto move the arm upwardly and to keep the roller 8i in contact with theface 8B of the cam 8l).

CII

A cam lever is mounted upon the lower end 82 of the arm 43 and pivotedthereto at SI. The cam lever 9U is provided with a handle 92 whichextends through the lever 9B to form a stop against the lower end 82 ofthe arm 4D at 93. When the pinker is to be thrown out of operation thecam lever 98 is swung upwardly, the extended part thereof 34 engagingthe lower end of the frame I4 and holding the arm 40 in a downwardposition. In this position roller BI is out of contact with the face 86of cam 86 and the knife G0 is held at its lower position in the throatplate I3 and out of action.

When the operation is to be resumed cam lever S0 is swung downwardlywithdrawing the extended edge 94 from the lower end 95 of the frame I4thus permitting the spring 83 to move the arm 43 upwardly and causingthe roller 8l to contact and engage the face 8B of the cam 80 movingupwardly and downwardly with it to actuate the arm 40 and hence thepinking knife B. It will be noted that spring 83 is at an angle withrelation to the arm 40. Thus it not only tends to keep the roller incontact with face 8B of the cam 80 but exerts a backward or sidewardtension on the arm 43 pivoting on the roller 13 so as to keep thecutting edges 6I of the knife 60 in pressure contact with the cuttingedges 62 of the throat plate I3 to insure a cutting action as the knifemoves upwardly and downwardly. The spring 83 may be attached to aslidable bracket similar to the bracket G1 shown in Fig, 1 in order thatthe angle of the spring 83 may be varied and thus increase or decreasethe tension on the arm 43 when variation of cutting pressure of knifeE!) upon throat plate I3 is desired.

It will be appreciated that with our improved construction the deviceutilizes a minimum of moving parts and the one reciprocating member 43being of floating design is reduced in weight with the resultantreduction of vibration to a minimum. Furthermore, this type ofconstruction will transmit less vibration to the bed of the sewingmachine to which it is attached so as not to disturb its normaloperation. As previously stated it is possible with our device toconvert the standard sewing machine into one which pinks as it sewswithout mutilating or destroying the machine for plain sewing oraffecting its operation in any way. At the same time our device providesfor the instantaneous throwing in and out of operation of the pinkingmechanism .at the will of the operator.

We claim:

1. A pinking attachment for sewing machines including a frame-adapted tobe mounted below the bed of said sewing machine, a shaft in said frame,means engaging the hook shaft of the sewing machine to rotate saidshaft, a two-faced cam on said shaft, a floating arm, rollers on saidarm engaging said cam, and a pinking knife mounted on said arm.

2. A pinking attachment for sewing machines comprising a pinking knife,an arm engaging said knife and extending below the bed of said machine,rollers on said arm, an eccentric cam contacting said rollers, and meansfor throwing one of said rollers out of operable contact with said cam.

3. A pinking attachment for sewing machines comprising a frame adaptedto be placed below the bed of said machine, a shaft in said frame, gearmeans to operate said shaft, a oating arm,

a knife on said arm, a cam on said shaft, and roller means on said armengaging said cam.

4. The combination with a sewing machine of pinking mechanism comprisinga ledger blade, a pinking head for coacting with the ledger blade, anarm carrying said head, and means for operatively holding said arm in afloating condition including a member in sliding engagement with saidarm and spring means for continually biasing said arm about said memberin a direction to insure a clean shearing action on the downward strokesof said arm and head.

5. The combination with a sewing machine of pinking mechanism comprisinga throat plate, a pinking head for pinking coaction with the throatplate, an arm carrying said head and extending into the sewing machine,and means for operatively holding said arm in a floating conditionincluding a member in sliding engagement with said arm and spring meansconnected with said arm for continually pivoting said arm about saidmember in a direction to insure a clean shearing action on the downwardstrokes of said arm and head.

6. The combination with a sewing machine of pinking mechanism comprisinga throat plate having an opening with converging shearing walls, apinking head with converging walls for coacting with the throat platewalls, an arm carrying said head and extending into the sewing machinebeneath the bed thereof, means for operatively holding said arm in afloating condition including a member in sliding engagement with saidarm and resilient means connected with said arm for continually urgingsaid arm about said member and in a direction whereby the apex of saidhead is urged towards the apex of said throat plate to insure a cl-eanshearing action on the downward strokes of said arm and head, and meanscoupled to said floating arm for reciprocating said head in said throatplate.

7. 'I'he combination with a sewing machine of pinking mechanismcomprising a throat plate having an opening with converging shearingwalls, a pinking head with converging walls for coacting with the throatplate walls, an arm carrying said head and extending into the sewingmachine beneath the bed thereof, means for operatively holding said armin a floating condition including a member in sliding engagement withsaid arm and spring means connected with said arm for continuallybiasing said arm about said member in a direction whereby the apex ofsaid head is urged towards the apex of said throat plate to insure aclean shearing action on the downward strokes of said arm and head, andmeans coupled to said floating arm for operating said head in saidthroat plate upwardly and downwardly.

8. The combination with a sewing machine of pinking mechanism comprisinga throat plate, a pinking head for pinking coaction with the throatplate, an arm carrying said head and extending into the sewing machine,and means for operatively holding said arm in a floating conditionincluding a member in sliding engagement with said arm and spring meansconnected with said arm for continually pivoting said arm about saidmember in a direction to insure a clean shearing action on the downwardstrokes of said arm and head, and means coupled to said floating arm foroperating said head in said throat plate upwardly to the extent ofraising said head to clear the plane of said plate and permit materialto pass rial by the coaction of said head and said plate.

9. The combination with a sewing machine of.

pinking mechanism comprising a throat plate, a

pinking knife for coacting with said throat plate, i

a oatingly supported arm carrying said knife and extending into thesewing machine beneath the bed thereof, and means coupled to said armfor operating said knife upwardly to clear the l0 plane of said plateand permit material to pass therebetween and downwardlyy to pink thematethroat plate walls, a fioatingly supported arm carrying said headand extending vertically into the sewing machine beneath the bedthereof, and means connected with the apparatus driving said 'ineedleand coupled to said floating arm for operating said head in said throatplate in timed relation with said needle comprising cam means, reductiongearing between said driving apparatus and said cam means, and camfollower means 36""-mounted on said arm and engaging said cam means.

1l. The 'combination with a sewing machine having a reciprocatory needleof pinking mechanism comprising a throat plate having an openging withconverging shearing walls, a pinking head with converging walls forcoacting with the throat plate walls, an arm carrying said headandextending vertically into the sewing machine beneath the bed thereof,means for operatively holding said arm in a floating condition includinga roller in sliding engagement with said arm and spring means connectedwith said arm for continually pivoting said arm about said roller in adirection whereby the apex of said head is urged towards the apex ofsaid throat plate to insure a clean shearing action on the downwardstrokes of said arm and head, and means connected with the apparatusdriving said needle and coupled to said floating arm for operating saidhead in said throat plate in timed relation with said needle comprisingcam means, reduction gearing between said driving apparatus and said cammeans, and cam follower means mounted on said arm engaging said cammeans.

12. The combination with a sewing machine having a reciprocatory needleof pinking mechanism comprising a ledger blade having an opening withconverging shearing walls mounted substantially ush with the bed of themachine, a pinking knife with converging walls for successively coactingwith the ledger blade walls, a oatingly supported arm carrying saidknife and extending into the sewing machine beneath the bed thereof, andmeans connected with the apparatus driving said needle and coupled tosaid floating arm for operating said knife in said ledger blade in timedrelation with said needle comprising a cam, reduction gearing betweensaid driving apparatus and said cam, a roller mounted on said arm andengaging said cam, and an instrumentality for disengaging said arm fromsaid cam to hold said pinking knife inoperative in said ledger blade andsubstantially flush with the top surface thereof.

13. The combination with a sewing machine therebetween and downwardly topink the matehaving a recinroeatory needle of pinning meehenismcomprising a throat plate mQunted substantially in the plane of the topbed of the sewing machine and having an opening with converging shearingwalls, a pinking head with converging walls for coacting with the throatplate walls, a floatingly supported arm carrying said head and extendingvertically into the sewing machine beneath the 'ced thereof, means`connected with the apparatus driving said needle and coupled to saidoating arm for operating said head in said throat plate in timedrelation with said needle comprising a cam, reduction gearing betweensaid driving apparatus and said cam, and a cam follower mounted on saidarm and engaging said cam, and an instrumentality for disengaging saidarm from said cani to hold said pinking head inoperative in said throatplate and substantially flush with the top surface thereof.

14. The combination with a sewing machine of pinking mechanismcomprising a throat plate, a pinking head for pinking coaction with thethroat plate, an arm carrying said head and extending into the sewingmachine, means for operatively holding said arm in a oating conditionincluding a member in sliding engagement with said arm and spring meansconnected with said arm for continually pivoting said arm about saidmember in a direction to insure a clean shearing action on the downwardstrokes of said arm and head, and an element for adjusting the pressureof said member on said arm.

15. The combination with a sewing machine of pinking mechanismcomprising a throat plate, a

pinking knife for coacting with said throat plate, L

a oatingly supported arm carrying said knife and extending into thesewing machine beneath the bed thereof, and means coupled to said armfor positively operating Said knife upwardly t0 clear the plane of saidplate and permit material to pass therebetween and downwardly to pinkthe material by the coaction of said knife and said plate comprising adouble faced cam, two

rollers mounted on said arm and respectively engaging the faces of saidcam, and an instrumen-y tality for disengaging one of said rollers fromsaid cam to hold said pinking knife inoperative and substantially flushwith the top surfaces of said throat plate.

16. The combination with a sewing machine of pinking mechanismcomprising a throat plate having an opening with converging shearingWalls, a pinking head with converging walls for coacting with the throatplate walls, an arm carrying said head and extending into the sewingmachine beneath the bed thereof, means for operatively holding said armin a floating condition including a member in sliding engagement withsaid arm and spring means connected with said arm for continuallybiasing said arm about said member in a direction whereby the apex ofsaid head is urged towards the apex of said throat plate to insure aclean shearing action on the downward strokes of said arm and head, anelement for adjusting the pressure of said member on said arm, meanscoupled to said floating arm for operating said head in said throatplate upwardly and downwardly comprising a double faced cam, two rollersmounted on said arm and engaging the faces of said cam, and aninstrumentality for disengaging one of said rollers from said cam tohold said pinking head inoperative and substantially flush with the topsurface of said throat plate.

MORRIS GLASSBERG. BERNARD CHESTER.

